You can add images to your content pages on Recsite easily. When logged in as an admin, you click on Contents, find the article you want to change and click 'edit'. When you are in the editor you should place the cursor where you want the image to be inserted. Then you click the 'add/edit image' button which is visible in the editor bar (It's next to the add hyperlink button):
This will open up the insert image pop up. You can add an image via a URL, or most commonly you would upload the image yourself. To do this click on the 'Upload' icon and then you can browse upload OR drag and drop your chosen image into the upload box.
Once the image is uploaded, you will need to select it from the list of imaged (you may have to scroll down) and then choose it's alignment on the page.
NOTE: It is best practice to resize the image to the correct dimensions before uploading to avoid skewering or loss of resolution when resizing via the editor.